Yep... DX7 is still my favorite pedal steel keyboard. Got an E! expanded one to this day. A classic.
Best thing abut FM was, if it got the sound about right, velocity could alter the sound in a very smooth way, not the sudden jumps of sound that cross-switched samples do. And, as a horn player, you can imagine how the breath controller used to make my day!
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An arranger is just a tool. What matters is what you build with it..!